Your camera should automatically pick the lowest ISO speed (50 or 100)- the lower the number in "film" speed, the truer the colors will be and the finer the grain. This is why sunny days are great for capturing nature and buildings. So let your camera's meter do the work for you and you can focus on colors, composition, and interesting shadows. As for photographing people, keep them in the shade or have their backs to the sun.. then manually turn your flash to "ON" so you'll be filling in the darker shadows with some flash while the rest of shot remains in the correct exposure.. giving added ooph to your images!
